//
//  WBNavigationController.swift
//  SilenceWeibo
//
//  Created by admin on 2017/6/19.
//  Copyright © 2017年 honliv. All rights reserved.
//

import UIKit

class WBNavigationController: UINavigationController {
    
    override func viewDidLoad() {
        super.viewDidLoad()
        
        //隐藏默认的 NavigationBar
        navigationBar.isHidden = true
        
    }
    
    
    //重写push方法，所有的push方法都会调用此方法
    //viewController 是被 push 的控制器，设置他的左侧的按钮作为返回按钮
    override func pushViewController(_ viewController: UIViewController, animated: Bool) {
        
        //如果不是栈底控制器才需要隐藏，根控制器不需要处理
        if childViewControllers.count > 0 {
            //隐藏底部的tabbar
            viewController.hidesBottomBarWhenPushed = true
            //判断控制器类型
            if let vc = viewController as? WBBaseViewController{
                
                var title = "返回"
                //判断控制器的级数
                if childViewControllers.count == 1{
                    //title显示首页的标题
                    title = childViewControllers.first?.title ?? "返回"
                }
                //取出自定义的navItem,设置左侧按钮作为返回按钮
                vc.navItem.leftBarButtonItem = UIBarButtonItem(title: title, target: self, action: #selector(popToParent), isBack:true)
            }
            
        }
        
        super.pushViewController(viewController, animated: true)
    }
    
    /// 返回到上一级控制器
    @objc fileprivate func popToParent(){
        popViewController(animated: true)
    }
}
